Re: ms_sysenter_eip zero value

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On 01/23/2011 01:25 PM, Matteo Signorini wrote:
Hi,

I'm having some problems understanding the sysenter instruction.
As far as I know, in order to successfully call the sysenter instruction,
MSR_IA32_SYSENTER_CS and MSR_IA32_SYSENTER_EIP registers have to be
correctly set.

So I printed the value of such registers while the VM was running but
the output is 0 for both.

now:

1) I'm having this problem ONLY with the Intel CPU (vmx.c source code).
When I run the same code on an AMD CPU (svm.c source code)
MSR_IA32_SYSENTER_EIP and MSR_IA32_SYSENTER_CS contain nonzero values.

2) I am 100% sure the guest is not executing an int80 but a sysenter

so there is something here I can't understand...
please help me solving this problem.

How are you printing out the values? Maybe the problem is there?

--
error compiling committee.c: too many arguments to function

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